P
US8506733B2ActiveUtilityPatentIndex 76

Al2Ca-containing magnesium-based composite material

Assignee: ENAMI KEITAROPriority: Mar 11, 2008Filed: Mar 11, 2009Granted: Aug 13, 2013
Est. expiryMar 11, 2028(~1.7 yrs left)· nominal 20-yr term from priority
Inventors:ENAMI KEITAROONO SHOJIOHARA MASAKIIGARASHI TAKANORI
C22F 1/06C22C 23/02C22C 23/00B22F 2998/00C22C 1/047C22C 1/0408C22C 1/051B22F 3/02
76
PatentIndex Score
13
Cited by
8
References
24
Claims

Abstract

The present invention provides a magnesium-based composite material that can achieve excellent performance such as high tensile strength not only at ordinary temperature but also at high temperature. The magnesium-based composite material of the present invention is Al 2 Ca-containing magnesium-based composite material, wherein said composite material is obtained by a solid-phase reaction of an aluminum-containing magnesium alloy and an additive, said additive being calcium oxide, and said composite material contains Al 2 Ca formed in the solid-phase reaction. In the magnesium-based composite material, CaO, in combination with Al 2 Ca, can be dispersed.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A method for producing an Al 2 Ca-containing magnesium-based composite material comprising carrying out a solid-phase reaction of an aluminum-containing magnesium alloy and an additive, wherein said additive is calcium oxide, and said composite material contains Al 2 Ca formed in the solid-phase reaction. 
     
     
       2. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein the aluminum-containing magnesium alloy is a magnesium alloy containing at least one of alloyed aluminum and mixed aluminum. 
     
     
       3. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein CaO, in combination with Al 2 Ca, is dispersed in the magnesium-based composite material. 
     
     
       4. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , said solid-phase reaction comprising: mechanically refining, in grain size, a mixture of the aluminum-containing magnesium alloy and the additive while maintaining a solid phase state to prepare a grain-refined mixture, and carrying out a thermochemical reaction, at less than the melting point, of the grain-refined mixture or its green compact. 
     
     
       5. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein the Al 2 Ca is formed by the thermochemical reaction, by heating to 350 to 550° C., of the grain-refined mixture or its green compact. 
     
     
       6. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein the thermochemical reaction is sintering. 
     
     
       7. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein plastic working is carried out after the thermochemical reaction. 
     
     
       8. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein plastic working is carried out during the thermochemical reaction. 
     
     
       9. The method for producing the Al 2 Ca-containing magnesium based composite material of  claim 8 , wherein the composite metal is obtained by mechanically refining, in grain size, the mixture of the aluminum-containing magnesium alloy and the additive while maintaining the solid phase state to prepare the grain-refined mixture, and by carrying out the plastic working, at less than the melting point, of the grain-refined mixture or its green compact. 
     
     
       10. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 9 , wherein the plastic working is extrusion. 
     
     
       11. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 10 , wherein the extrusion temperature is 350 to 550° C. 
     
     
       12. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein the amount of the additive in the mixture of the aluminum-containing magnesium alloy and the additive, which are to be refined in grain size, is 1 to 20% by volume. 
     
     
       13. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 4 , wherein the amount of the additive is adjusted so that the mole ratio of Ca/Al in the mixture of the aluminum-containing magnesium alloy and the additive, which are to be refined in grain size, is 0.5 or higher. 
     
     
       14. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein the maximum size of dispersed Al 2 Ca particles in the composite material is 5 microns or less, and when dispersed CaO particles in the composite material are present, the maximum size of dispersed CaO particles is 5 microns or less. 
     
     
       15. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein the maximum size of the magnesium alloy crystal grain in the composite material is 20 microns or less. 
     
     
       16. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein Al 12 Mg 17  is not contained in the composite material. 
     
     
       17. The method for producing the Al 2 Ca-containing magnesium-based composite material of  claim 1 , wherein the composite metal has the tensile strength of 400 MPa or higher at 20° C. and the tensile strength of 100 MPa or higher at 250° C. 
     
     
       18. A method for producing a material for thermochemical reaction or plastic working, comprising mechanically refining, in grain size, a mixture of an aluminum-containing magnesium alloy and an additive while maintaining a solid phase state to prepare a grain-refined mixture, wherein said grain-refined mixture or its green compact is the material and said additive is calcium oxide, wherein the material is heated at less than the melting point to form Al 2 Ca. 
     
     
       19. The method for producing the material for thermochemical reaction or plastic working of  claim 18 , wherein the aluminum-containing magnesium alloy is a magnesium alloy containing at least one of alloyed aluminum and mixed aluminum. 
     
     
       20. The method for producing the material for thermochemical reaction or plastic working of  claim 18 , wherein the heating temperature is 350 to 550° C. 
     
     
       21. The method for producing the material for thermochemical reaction or plastic working of  claim 18 , wherein the amount of the additive in the mixture of the aluminum-containing magnesium alloy and the additive, which are to be refined in grain size, is 1 to 20% by volume. 
     
     
       22. The method for producing the material for thermochemical reaction or plastic working of  claim 1 , wherein the amount of the additive is adjusted so that the mole ratio of Ca/Al in the mixture of the aluminum-containing magnesium alloy and the additive, which are to be refined in grain size, is 0.5 or higher. 
     
     
       23. The method for producing the material for thermochemical reaction of  claim 18 , wherein the thermochemical reaction is sintering. 
     
     
       24. The method for producing the material for plastic working of  claim 18 , wherein the plastic working is extrusion.

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